Open Access
Table B
Description of variables in the daily TEGIX data product
Further information about the definition of the MIGRAS products can be found on ESA’s webpage at https://earth.esa.int/eogateway/activities/migrashttps://earth.esa.int/eogateway/activities/migras.
| Name | Description | Unit |
|---|---|---|
| Timestamp | Time in Universal Time | |
| Longitude_Swarm | Averaged geocentric longitude of the Swarm satellites for all combined measurements for a certain epoch | deg |
| Latitude_Swarm | Averaged geocentric latitude of the Swarm satellites for all combined measurements for a certain epoch | deg |
| Longitude_IPPs | Position of TEGIX in geocentric longitude. Averaged longitude position of the central points (CPs) derived from the combination of VTEC measurements of Swarm A and C. | deg |
| Latitude_IPPs | Position of TEGIX in geocentric latitude. Averaged latitude position of the central points (CPs) derived from the combination of VTEC measurements of Swarm A and C. | deg |
| Distance | Averaged distance (Δs) value from all dipoles used for the estimation of TEGIX values | m |
| Azimuth | Averaged azimuth (δ) value from all dipoles used for the estimation of TEGIX values | deg |
| Tegix_X | Mean value of TEGIX for the West-East component | milli-TECU m−1 |
| Tegix_X_Sigma | Standard deviation value of TEGIX for the West-East component | milli-TECU m−1 |
| Tegix_X_P95 | 95th-percentile value of TEGIX for the West-East component | milli-TECU m−1 |
| Tegix_Y | Mean value of TEGIX for the South-North component | milli-TECU m−1 |
| Tegix_Y_Sigma | Standard deviation value of TEGIX for the South-North component | milli-TECU m−1 |
| Tegix_Y_P95 | 95th-percentile value of TEGIX for the South-North component | milli-TECU m−1 |
| Tegix_Total | Total vector value of TEGIX, derived from the mean West-East and South-North components | milli-TECU m−1 |
| Tegix_Sigma | Vector value of the standard deviation of TEGIX, derived from the standard deviation values of West-East and South-North components | milli-TECU m−1 |
| Tegix_P95 | Vector value of the 95th-percentile of TEGIX, derived from the 95th-percentile values of West-East and South-North components | milli-TECU m−1 |
| N_Measurements | Number of elements for a data record from which TEGIX is determined | |
| Flag_Tegix | Flags characterizing the dispersion of gradient values that are used to compute the total vector Tegix_Total | |
| Orbit_Label | Value defining whether the magnitude belongs to an ascending or descending orbit of the Swarm satellites |
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